1 /** 2  *  3  */ 4 package com.b510.image.clent; 5  6 import java.io.File; 7  8 import com.b510.image.common.Common; 9 import com.b510.image.util.ImageUtil;10 11 /**12  * @author Hongten13  * @create 2014-7-1314  * @mail hongtenzone@foxmail.com15  */16 public class Client {17 18     public static void main(String[] args) {19         File input = new File(Common.ORGINAL_IMAGE);20         File out = new File(Common.PROCESSED_IMAGE);21         ImageUtil.changeImge(input, out);22     }23 }

 1 /** 2  *  3  */ 4 package com.b510.image.common; 5  6 /** 7  * @author Hongten 8  * @create 2014-7-13 9  * @mail hongtenzone@foxmail.com10  */11 public class Common {12 13     // Orginal image path14     public static String ORGINAL_IMAGE = "src/com/b510/image/resources/orginal_image.jpg";15     // Processed image path16     public static String PROCESSED_IMAGE = "src/com/b510/image/resources/processed_image.jpg";17 18     public static String PROCESS_SUCCESS = "Processed successfully.....";19     public static String PROCESS_ERROR = "Processing encounters error!";20 }

 1 /** 2  *  3  */ 4 package com.b510.image.util; 5  6 import java.awt.Image; 7 import java.awt.color.ColorSpace; 8 import java.awt.image.BufferedImage; 9 import java.awt.image.ColorConvertOp;10 import java.io.File;11 import java.io.FileOutputStream;12 import java.io.IOException;13 14 import javax.imageio.ImageIO;15 16 import com.b510.image.common.Common;17 import com.sun.image.codec.jpeg.JPEGCodec;18 import com.sun.image.codec.jpeg.JPEGImageEncoder;19 20 /**21  * @author Hongten22  * @create 2014-7-1323  * @mail hongtenzone@foxmail.com24  */25 public class ImageUtil {26     /**27      * Color image is converted to black and white picture.28      */29     public static void changeImge(File input, File out) {30         try {31             Image image = ImageIO.read(input);32             int srcH = image.getHeight(null);33             int srcW = image.getWidth(null);34             BufferedImage bufferedImage = new BufferedImage(srcW, srcH, BufferedImage.TYPE_3BYTE_BGR);35             bufferedImage.getGraphics().drawImage(image, 0, 0, srcW, srcH, null);36             bufferedImage = new ColorConvertOp(ColorSpace.getInstance(ColorSpace.CS_GRAY), null).filter(bufferedImage, null);37             FileOutputStream fos = new FileOutputStream(out);38             JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(fos);39             encoder.encode(bufferedImage);40             fos.close();41             System.out.println(Common.PROCESS_SUCCESS);42         } catch (IOException e) {43             e.printStackTrace();44             throw new IllegalStateException(Common.PROCESS_ERROR, e);45         }46     }47 48 }